Sleep: cycles, myths and records
90-minute cycles, REM sleep and wild sleep-deprivation records: how well do you know your nights?
What this quiz asks
- 1Roughly how long does one sleep cycle last in adults?
- 2During which phase do the most vivid dreams occur?
- 3What does the abbreviation REM stand for?
- 4How many hours of sleep are recommended for a healthy adult?
- 5How many cycles typically follow one another over a night?
- 6During REM sleep, what state are your muscles in?
- 7Across the night, how do the REM phases change?
- 8What does science say about dreaming at night?
- 9What is the ballpark of the documented record for voluntary sleep deprivation?
- 10Which molecule builds up in the brain and creates "sleep pressure" over the day?
